best_effort_vlan_filtering |
Boolean |
runtime |
Allow plain ETH_P_8021Q headers to be used as DSA tags.
Benefits:
- Can terminate untagged traffic over switch net
devices even when enslaved to a bridge with
vlan_filtering=1.
- Can terminate VLAN-tagged traffic over switch net
devices even when enslaved to a bridge with
vlan_filtering=1, with some constraints (no more than
7 non-pvid VLANs per user port).
- Can do QoS based on VLAN PCP and VLAN membership
admission control for autonomously forwarded frames
(regardless of whether they can be terminated on the
CPU or not).
Drawbacks:
- User cannot use VLANs in range 1024-3071. If the
switch receives frames with such VIDs, it will
misinterpret them as DSA tags.
- Switch uses Shared VLAN Learning (FDB lookup uses
only DMAC as key).
- When VLANs span cross-chip topologies, the total
number of permitted VLANs may be less than 7 per
port, due to a maximum number of 32 VLAN retagging
rules per switch.
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